森林食叶害虫的爆发改变了北方水域的养分循环。
Forest defoliator outbreaks alter nutrient cycling in northern waters.
机构信息
Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, UK, CB2 3EA.
Forest Ecology and Conservation Group, University of Cambridge Conservation Research Institute, University of Cambridge, Cambridge, UK, CB2 3QZ.
出版信息
Nat Commun. 2021 Nov 3;12(1):6355. doi: 10.1038/s41467-021-26666-1.
Insect defoliators alter biogeochemical cycles from land into receiving waters by consuming terrestrial biomass and releasing biolabile frass. Here, we related insect outbreaks to water chemistry across 12 boreal lake catchments over 32-years. We report, on average, 27% lower dissolved organic carbon (DOC) and 112% higher dissolved inorganic nitrogen (DIN) concentrations in lake waters when defoliators covered entire catchments and reduced leaf area. DOC reductions reached 32% when deciduous stands dominated. Within-year changes in DOC from insect outbreaks exceeded 86% of between-year trends across a larger dataset of 266 boreal and north temperate lakes from 1990 to 2016. Similarly, within-year increases in DIN from insect outbreaks exceeded local, between-year changes in DIN by 12-times, on average. As insect defoliator outbreaks occur at least every 5 years across a wider 439,661 km boreal ecozone of Ontario, we suggest they are an underappreciated driver of biogeochemical cycles in forest catchments of this region.
昆虫食叶者通过消耗陆地生物量和释放易生物降解的粪便，将生物地球化学循环从陆地转移到受纳水体。在这里，我们在 32 年间，在 12 个北方森林流域的 12 个集水区中，将昆虫爆发与水质化学联系起来。我们报告说，当食叶者覆盖整个集水区并减少叶面积时，湖水的溶解有机碳 (DOC) 平均降低 27%，溶解无机氮 (DIN) 浓度平均升高 112%。当落叶林占主导地位时，DOC 的减少达到 32%。在 1990 年至 2016 年间，来自 266 个北方和北温带湖泊的更大数据集显示，昆虫爆发引起的年内 DOC 变化超过了年间趋势的 86%。同样，昆虫爆发引起的年内 DIN 增加平均超过当地 12 倍的年间 DIN 变化。由于昆虫食叶者在安大略省更广泛的 439,661 平方公里北方生态区每 5 年至少发生一次，我们认为它们是该地区森林流域生物地球化学循环的一个被低估的驱动因素。
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